Add EncodeRGBAPNGWithChecksum method.

Add EncodeRGBAPNGWithChecksum method.

Adding this method is to dump image for DRT on Chromium Android port.
See https://bugs.webkit.org/show_bug.cgi?id=84682 for details.

NOTE. Skia pixel layout definition is in
<chrome-source-root>/third_party/skia/include/core/SkPostConfig.h for Chromium Android platform.
<chrome-source-root>/skia/config/SkUserConfig.h for other Chromium platforms.


BUG=None.
TEST=should not affect any tests.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=133861

[Johnny(Jianning) Ding, 2012-04-24 16:06:45]

On 2012/04/24 09:27:42, Johnny(Jianning) Ding wrote:

Just found it's unnecessary to add the method. Close it.

[Johnny(Jianning) Ding, 2012-04-24 16:13:36]

On 2012/04/24 16:06:45, Johnny(Jianning) Ding wrote:
> On 2012/04/24 09:27:42, Johnny(Jianning) Ding wrote:
> 
> Just found it's unnecessary to add the method. Close it.
The method is still needed. Reopen it.

[Johnny(Jianning) Ding, 2012-04-25 02:37:51]

On 2012/04/24 16:13:36, Johnny(Jianning) Ding wrote:
> On 2012/04/24 16:06:45, Johnny(Jianning) Ding wrote:
> > On 2012/04/24 09:27:42, Johnny(Jianning) Ding wrote:
> > 
> > Just found it's unnecessary to add the method. Close it.
> The method is still needed. Reopen it.

[tkent, 2012-04-25 03:02:48]

LGTM

[commit-bot: I haz the power, 2012-04-25 03:18:57]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jnd@chromium.org/10202008/6001

[commit-bot: I haz the power, 2012-04-25 04:46:25]

Change committed as 133861